The Ionian mode starts on D
The pattern is Tone - Semitone - Tone - Tone - Tone - Semitone - Tone
The semitones are between the 2nd & 3rd and 6th & 7th degrees of the scale.
Music that uses the Dorian mode is slightly sad, but in a hopeful way. It is a cloud with a silver lining.
It is well known for its use in
Another Brick in the Wall by Pink Floyd
Radioactive by Imagine Dragons
Moondance by Van Morrison
Horse with No Name by America
So What by Miles Davies
This mode is used a lot in blues, jazz and funk.